A steel inlet and outlet control system and control method for an end-in-end-out push-steel heating furnace

Abstract

The invention discloses a steel entry and exit control system and control method for an end-in-end-out push-steel heating furnace, belonging to the technical field of steel entry and exit equipment for push-steel furnaces. A photoelectric sensor I is arranged at the initial working position of a steel pusher or a steel tapping machine, and the photoelectric sensor I is electrically connected to the steel pusher or the steel tapping machine through a PLC control unit and clears the detection stroke of pushing and taking steel; a photoelectric sensor II is arranged at the opening position of a clutch I or a clutch II, and a photoelectric sensor III is arranged at the closing position of a clutch I or a clutch II, and a host computer, photoelectric sensor II and photoelectric sensor III are electrically connected to the clutch I or the clutch II through a PLC control unit. The invention has the beneficial effect that, after each steel pushing and taking action is completed, the steel pusher and the steel taking machine can automatically return to the initial position, thereby reducing the failure rate, and can perform accurate clutching and engaging actions, with convenient operation, ensuring that the steel pushing arm or the steel taking arm is on the same horizontal line after closing, thereby saving labor costs.

Description

Technical Field

[0001] The invention relates to the technical field of steel-in and steel-out equipment for a pusher furnace, and in particular to a steel-in and steel-out control system and a control method for an end-in and end-out pusher type heating furnace. Background Art

[0002] In the heating furnace that adopts the design of pushing steel into the furnace and steel tapping machine out of the furnace, the raw material size is divided into single row and double row according to the finished product structure design. When double row is put into the furnace, the steel pusher distinguishes the east and west parts of the steel push action and pushes the billet into the furnace respectively. When the long billet is designed to be put into the furnace in a single row, the two sets of steel pushers need to move synchronously to push the billet into the furnace horizontally. When tapping, the steel tapping machine needs to realize the steel taking action of a single set of steel taking arms or the synchronous steel taking of two sets of steel taking arms according to whether the billet in the furnace is single row or double row.

[0003] However, in the above process, the following problems exist: 1. The existing steel pushing stroke of the steel pusher and the steel taking stroke of the steel tapping machine are generally set by the stroke of the motor, that is, the encoder is used to detect the stroke of the driving motors of the two sets of steel pushers and the steel tapping machine. When the steel pushing stroke or the steel taking stroke is reached, the PLC controls the motor to stop rotating, and the steel pusher and the steel tapping machine are reset. However, during the operation of the steel pusher and the steel tapping machine, the friction between the billet and the equipment will cause the detected speed to not match the actual speed, resulting in the steel pusher and the steel tapping machine being unable to return to the initial position. This cycle repeats, which causes the error of the steel pushing or steel taking stroke. The difference gradually increases, thus affecting the normal pushing and taking operations of steel; 2. When single-row pushing or tapping is required, the clutch between the two pushers or tapping machines cannot engage normally, or the pushing arm or the taking arm are not on the same horizontal line after engagement, resulting in the pusher or steel billet being not on the horizontal line after it is in place, causing the billet to be skewed when entering the furnace and affecting the tapping rhythm and timed output, and there may also be a risk of the heated billet falling during the process of tapping; 3. When the clutch is closed, it is usually necessary to use monitoring or on-site command to control the accurate engagement of the clutch of the pusher or tapping machine, which is time-consuming and labor-intensive. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a control system and control method for the in and out of an end-in and end-out push-steel heating furnace. After each steel pushing and taking action is completed, the steel pusher and the steel taking machine can automatically return to the initial position, which can ensure the normal action of steel pushing and taking, reduce the failure rate, and enable accurate clutch action between the two groups of steel pushers and steel taking machines. The clutch operation is convenient, which can ensure that the steel pushing arm or the steel taking arm is on the same horizontal line after closing.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention to solve its technical problem is: the end-in-end-out push-steel heating furnace in-and-out steel control system includes a heating furnace, a pusher, a steel tapping machine, a clutch I, a clutch II, a host computer and a PLC control unit, the two groups of the pusher arms are connected by a clutch I, the two groups of the steel taking arms are connected by a clutch II, the pushing ends of the two groups of the pushers are opposite to the feeding port of the heating furnace, and the taking ends of the two groups of the steel tapping machines are opposite to the discharging port of the heating furnace, and a photoelectric sensor I is arranged at the initial working position of the pusher or the steel tapping machine, and the photoelectric sensor I is electrically connected to the pusher or the steel tapping machine through the PLC control unit and clears the detection stroke of pushing steel and taking steel; a photoelectric sensor II is arranged at the opening position of the clutch I or the clutch II, and a photoelectric sensor III is arranged at the closing position of the clutch I or the clutch II, and the host computer, the photoelectric sensor II and the photoelectric sensor III are electrically connected to the clutch I or the clutch II through the PLC control unit.

[0006] Furthermore, the steel pusher and the steel tapping machine both include a gear rack drive mechanism, which includes a drive motor, a gear and a rack bar, the output shaft end of the drive motor is connected to the gear, and the gear is meshed with the rack bar.

[0007] Furthermore, the drive motor is provided with an encoder for detecting the stroke of the drive motor, and the encoder is electrically connected to the drive motor through a PLC control unit to control the speed of the drive motor. The photoelectric sensor I is connected in parallel with the encoder and electrically connected to the drive motor through the PLC control unit to control the drive motor to stop in place and clear the stroke detected by the encoder.

[0008] Furthermore, the structures of the clutch I and clutch II are the same, and both are configured as tooth clutches, including a left half clutch and a right half clutch. The left half clutch includes a driven shaft, and the driven shaft is connected to the output shaft of the driving motor. The right half clutch includes a frame, a rotating arm, a driving shaft, a cylinder and a positioning plate. The frame is configured as a U-shaped frame, and the bottom two sides of the frame are fixedly connected to the driving shaft through rotating arms respectively, and the upper end of the frame is fixedly connected to the cylinder body of the cylinder. The ends of the two rotating arms are connected to the piston rod of the cylinder through a connecting shaft, and the two rotating arms move in the positioning plate along the length direction of the driving shaft. The photoelectric sensor II and the photoelectric sensor III are fixed on the positioning plate, and the driving shaft and the driven shaft are connected by end face tooth meshing.

[0009] Furthermore, the end face teeth of the driving shaft and the driven shaft are arranged as trapezoidal teeth, and the number of the end face teeth of the driving shaft or the driven shaft is arranged to be 4 to 6.

[0010] Furthermore, a fixed box is provided outside the steel pusher or steel tapping machine, the positioning plate is horizontally fixed on the inner wall of the fixed box, a U-shaped groove with an opening toward the cylinder is provided on the positioning plate, the photoelectric sensor II and the photoelectric sensor III are slidably installed in the U-shaped groove, and a guide groove is also provided on the positioning plate to match the clearance of the two rotating arms.

[0011] Furthermore, an electromagnetic reversing valve is arranged on the connecting gas path of the cylinder, and the host computer is connected to the electromagnetic reversing valve via a PLC control unit.

[0012] Furthermore, a hydraulic control component for driving the two groups of steel-outlets to rise or fall as a whole is provided at the bottom of the two groups of steel-outlets.

[0013] A control method for a single-row blank entering and exiting a push-steel heating furnace, using the end-in and end-out push-steel heating furnace entry and exit control system, comprises the following steps:

[0014] 1) After the two groups of pushers finish pushing steel, the drive motor of each pusher rotates in the opposite direction, driving the pusher arm of the pusher to retreat. The encoder detects the stroke of the drive motor in real time. When the pusher arm reaches the pusher stroke, the drive motor starts to decelerate until the rear end of the pusher arm is detected by the photoelectric sensor I. Then the photoelectric sensor I transmits the retreat position signal to the PLC control unit. The PLC control unit controls the drive motor to stop rotating and clears the steel-out stroke detected by the encoder.

[0015] 2) When the single-row billet to be heated is running on the furnace roller table, the host computer is operated to control the reversing of the electromagnetic reversing valve between the two sets of pushers through the PLC control unit, so that the piston rod of the cylinder drives the rotating arm to swing, so that the end face teeth on the driving shaft and the driven shaft are engaged to complete the closing action;

[0016] 3) When the end of the rotating arm reaches the detection position of the photoelectric sensor III, the photoelectric sensor III determines the closing position signal and transmits the signal to the PLC control unit. The PLC control unit controls the electromagnetic reversing valve to change direction, so that the piston rod of the cylinder stops moving. Then the PLC control unit controls the driving motor of the pusher to rotate, so that the pusher arm of the pusher extends slowly at a set speed. When the pusher arm contacts the single-row billet, the driving motor continues to rotate at a uniform speed. When the pusher arm is about to reach the door of the heating furnace, the driving motor slows down and pushes the single-row billet into the heating furnace at a slow speed.

[0017] 4) When the single-row billet after heating treatment in the heating furnace is transported out of the furnace, the upper computer is operated to control the reversing of the electromagnetic reversing valve between the two groups of steel-discharging machines through the PLC control unit, so that the piston rod of the cylinder drives the rotating arm to swing, so that the end face teeth on the driving shaft and the driven shaft of the steel-discharging machine are engaged to complete the closing action;

[0018] 5) When the end of the rotating arm reaches the detection position of the photoelectric sensor III, the photoelectric sensor III determines the closing position signal and transmits the signal to the PLC control unit. The PLC control unit controls the reversal of the electromagnetic reversing valve to stop the piston rod of the cylinder. Then the PLC control unit controls the drive motor to rotate so that the steel-taking arm of the steel-making machine extends slowly at a set speed. When the steel-taking arm contacts the single-row billet, the hydraulic control component of the steel-making machine lifts up a stroke, and the drive motor rotates in the opposite direction to make the steel-taking arm of the steel-making machine retreat at a uniform speed. When the photoelectric sensor I near the steel-making machine detects the retreat position signal of the steel-making machine and transmits the position signal to the PLC control unit, the PLC control unit controls the drive motor to stop rotating and clears the steel-taking stroke detected by the encoder. Then the steel-making machine descends under the drive of the hydraulic control component, so that the single-row billet taken out of the heating furnace falls onto the furnace roller and is transported to the next station.

[0019] A control method for a double-row billet inlet and outlet pusher type heating furnace, using the end-in-end-out pusher type heating furnace inlet and outlet steel control system, comprises the following steps:

[0020] 1) After the two groups of pushers finish pushing steel, the drive motor of each pusher rotates in the opposite direction, driving the pusher arm of the pusher to retreat. The encoder detects the stroke of the drive motor in real time. When the pusher arm reaches the pusher stroke, the drive motor starts to decelerate until the rear end of the pusher arm is detected by the photoelectric sensor I. Then the photoelectric sensor I transmits the retreat position signal to the PLC control unit. The PLC control unit controls the drive motor to stop rotating and clears the steel-out stroke detected by the encoder.

[0021] 2) When the double-row billets to be heated are running on the furnace roller table, the host computer is operated to control the reversing of the electromagnetic reversing valve between the two sets of pushers through the PLC control unit, so that the piston rod of the cylinder drives the rotating arm to swing, so that the end face teeth on the driving shaft and the driven shaft are separated to complete the opening action;

[0022] 3) When the end of the rotating arm reaches the detection position of the photoelectric sensor II, the photoelectric sensor III determines the gate opening position signal and transmits the signal to the PLC control unit. The PLC control unit controls the electromagnetic reversing valve to change direction, so that the piston rod of the cylinder stops moving. Then the PLC control unit controls the driving motor of the pusher to rotate, so that the pusher arm of the pusher extends slowly at the set speed. When the pusher arms of the two groups of pushers contact the double-row billets, the driving motor continues to rotate at a uniform speed. When the pusher arm is about to reach the door of the heating furnace, the driving motor slows down and pushes the single-row billets into the heating furnace at a slow speed.

[0023] 4) When the double-row billets after heating treatment in the heating furnace are transported out of the furnace, the upper computer is operated to control the reversing of the electromagnetic reversing valve between the two groups of steel-discharging machines through the PLC control unit, so that the piston rod of the cylinder drives the rotating arm to swing, so that the end face teeth on the driving shaft and the driven shaft of the steel-discharging machine are separated to complete the opening action;

[0024] 5) When the end of the rotating arm reaches the detection position of the photoelectric sensor II, the photoelectric sensor II determines the gate opening position signal and transmits the signal to the PLC control unit. The PLC control unit controls the electromagnetic reversing valve to change direction, so that the piston rod of the cylinder stops moving, and then the PLC control unit controls the drive motor to rotate so that the steel-taking arm of the steel-making machine slowly extends at a set speed. When the steel-taking arm contacts the single-row billet, the hydraulic control component of the steel-making machine lifts up a stroke, and the drive motor rotates in the opposite direction to make the steel-taking arm of the steel-making machine retreat at a uniform speed. When the photoelectric sensor I near the steel-making machine detects the retreat position signal of the steel-making machine and transmits the position signal to the PLC control unit, the PLC control unit controls the drive motor to stop rotating and clears the steel-taking stroke detected by the encoder. Then the steel-making machine descends under the drive of the hydraulic control component, so that the double-row billet taken out of the heating furnace falls onto the furnace roller and is transported to the next station.

[0025] The beneficial effects of the present invention are:

[0026] 1. The present invention sets a photoelectric sensor I at the initial working position of the steel pusher or the steel tapping machine. When the steel pusher and the steel tapping machine retreat after the work is finished, when the rear end of the steel pusher and the steel tapping machine retreats to the detection position of the photoelectric sensor I, the PLC control unit controls the steel pusher and the steel tapping machine to stop retreating and performs a zeroing operation on the detected stroke, thereby ensuring that the steel pusher and the steel tapping machine can automatically return to the initial position after each steel pushing and steel taking action is completed, ensuring the normal action of steel pushing and steel taking and reducing the failure rate; by using the clutch I between the two sets of steel pushers or the clutch between the two sets of steel tapping machines Photoelectric sensor II is set at the opening position of clutch II, and photoelectric sensor III is set at the closing position. During the process of giving instructions to the PLC control unit through the host computer to control clutch I or clutch II to perform opening and closing operations, the photoelectric sensor II and photoelectric sensor III can respectively detect the opening and closing signals, so that clutch I and clutch II can operate accurately, without the need for monitoring or on-site command to control the accurate engagement of the clutch of the steel pusher or steel tapping machine, thereby realizing automatic engagement and separation of the clutch, which is easy to operate, reduces the workload of operators, and saves labor costs.

[0027] 2. Specifically, an encoder is provided on the driving motor that drives the pusher or the steel-outlet machine, and the action stroke value of the pusher or the steel-outlet machine detected by the encoder is used as the position point for deceleration of the driving motor, so that the pusher or the steel-outlet machine gradually decelerates before reaching the detection position of the photoelectric sensor Ⅰ when retreating, which can reduce the error of the retreat data caused by the retreat inertia. When retreating to the position, the encoder cooperates with the photoelectric sensor Ⅰ as the stopping condition of the brake action, and controls the driving motor to achieve timely braking through the PLC control unit, thereby ensuring the accuracy of the retreat data and position.

[0028] 3. Specifically, in clutch I or clutch II, the end face teeth of the driving shaft and the driven shaft are set as trapezoidal teeth, and the number of teeth of the trapezoidal teeth is increased, so that the end face teeth are easy to bite when there is a range deviation between the two sets of pushers or steel tappers; and the photoelectric sensor II and the photoelectric sensor III are slidably installed in the U-shaped groove on the positioning plate, which is convenient for debugging the position of the photoelectric sensor II and the photoelectric sensor III.

[0029] In summary, after each steel pushing and taking action is completed, the control system can automatically return the steel pusher and steel taking machine to their initial positions, ensuring the normal steel pushing and steel taking actions of double-row and single-row billets, reducing the failure rate, and can perform accurate clutch actions with convenient clutch operation, ensuring that the steel pushing arm or steel taking arm is on the same horizontal line after closing, reducing the workload of operators and saving labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The following is a brief description of the contents expressed in the drawings of the present invention and the symbols in the drawings:

[0031] Figure 1 It is a structural schematic diagram of the steel inlet and outlet control system of the present invention;

[0032] Figure 2 for Figure 1 Structural diagram of clutch I or clutch II in the closed state;

[0033] Figure 3 for Figure 1 Structural schematic diagram of clutch I or clutch II in the open state;

[0034] Figure 4 for Figure 3 A top view of the matching relationship between the center positioning plate, the rotating arm and the cylinder;

[0035] Figure 5 It is the control principle diagram of the present invention;

[0036] The marks in the above figures are: 1. Heating furnace, 2. Steel pusher, 3. Steel tapping machine, 4. Clutch I, 41. Driven shaft, 42. Frame, 43. Rotating arm, 44. Driving shaft, 45. Cylinder, 46. Positioning plate, 461. U-shaped groove, 462. Guide groove, 5. Clutch II, 6. Photoelectric sensor I, 7. Photoelectric sensor II, 8. Photoelectric sensor III, 9. Gear rack drive mechanism, 91. Drive motor, 92. Gear, 93. Rack rod, 10. Encoder. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] The specific implementation scheme of the present invention is: Figure 1As shown, a steel feeding and discharging control system of an end-in-end-out push-steel heating furnace comprises a heating furnace 1, a steel pusher 2, a steel discharging machine 3, a clutch Ⅰ4, a clutch Ⅱ5, a host computer and a PLC control unit. The steel pushing arms of two sets of steel pushers 2 are connected by a clutch Ⅰ4, and the steel taking arms of two sets of steel discharging machines 3 are connected by a clutch Ⅱ5. The pushing ends of the two sets of steel pushers 2 are opposite to the feeding port of the heating furnace 1, and the taking ends of the two sets of steel discharging machines 3 are opposite to the discharging port of the heating furnace 1. A photoelectric sensor Ⅰ6 is arranged at the working initial position of the steel pusher 2 or the steel discharging machine 3. The photoelectric sensor Ⅰ 6 is electrically connected to the steel pusher 2 or steel tapping machine 3 through the PLC control unit and the detection stroke of steel pushing and steel taking is cleared. When the steel pusher 2 and steel tapping machine 3 retreat after the work is completed, when the rear ends of the steel pusher 2 and steel tapping machine 3 retreat to the detection position of the photoelectric sensor Ⅰ 6, the PLC control unit controls the steel pusher 2 and steel tapping machine 3 to stop retreating and clears the detection stroke, ensuring that after each steel pushing and steel taking action is completed, the steel pusher 2 and steel tapping machine 3 can automatically return to the initial position, ensuring the normal action of steel pushing and steel taking, and reducing the failure rate; Clutch Ⅰ 4 or A photoelectric sensor II7 is arranged at the opening position of the clutch II5, and a photoelectric sensor III8 is arranged at the closing position of the clutch I4 or the clutch II5. The upper computer, the photoelectric sensor II7 and the photoelectric sensor III8 are electrically connected to the clutch I4 or the clutch II5 through the PLC control unit. The in-position signals detected by the photoelectric sensors I6, II7 and III8 are transmitted to the upper computer through the PLC control unit. The in-position signals of the photoelectric sensors I6, II7 and III8 can be displayed on the upper computer. The upper computer is also provided with control buttons of "closing" and "opening". In the process of operating the control buttons of the upper computer to instruct the PLC control unit to control the clutch I4 or the clutch II5 to open and close, the photoelectric sensor II7 and the photoelectric sensor III8 can respectively detect the opening and closing in-position signals, so that the clutch I4 and the clutch II5 can be accurately operated without monitoring or on-site command to control the accurate engagement and separation of the clutch of the steel pusher or the steel tapping machine, thereby realizing automatic engagement and separation of the clutch, convenient operation, reducing the workload of the operating workers and saving labor costs.

[0040] Specifically, Figure 1 and Figure 5As shown, the steel pusher 2 and the steel tapping machine 3 both include a rack and pinion drive mechanism 9, which includes a drive motor 91, a gear 92 and a rack bar 93. The output shaft end of the drive motor 91 is connected to the gear 92, and the gear 92 is meshed with the rack bar 93. The rack bar 93 is the steel pushing arm of the steel pusher 2 or the steel taking arm of the steel tapping machine 3. Each group of steel pushers 2 or steel tapping machines 3 drives the gear 92 to rotate through the drive motor 91, thereby causing the rack bar 93 to move backward and forward. Each drive motor 91 is provided with an encoder 10 for detecting the stroke of the drive motor 91. The encoder 10 is electrically connected to the drive motor 91 through the PLC control unit to control the speed of the drive motor 91, that is, the pushing and taking strokes are set in advance in the PLC control unit, that is, the rotation stroke of the drive motor 91. The number of rotations and the rotation angle of the drive motor 91 can be obtained according to the stroke of one rotation of the drive motor 91. The encoder 10 detects the rotation angle of the drive motor 91, and the action stroke value of the pusher 2 or the steel tapper 3 detected by the encoder 10 is used as the position point for the drive motor 91 to decelerate, so that the pusher 2 or the steel tapper 3 gradually decelerates before retreating to the detection position of the photoelectric sensor Ⅰ6, which can reduce the backward inertia causing the backward in-position data error. When retreating in position, the encoder 10 cooperates with the photoelectric sensor Ⅰ6 as a stop condition, and controls the drive motor 91 through the PLC control unit to achieve timely braking, and clears the stroke detected by the encoder 10, ensuring the accuracy of the backward in-position data and position, and ensuring the normal pushing and taking of steel operations in the later stage.

[0041] Specifically, Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the structures of the clutch I4 and the clutch II5 are the same, and both are configured as tooth clutches, including a left half clutch and a right half clutch. The left half clutch includes a driven shaft 41, and the driven shaft 41 is connected to the output shaft of the drive motor 91. The right half clutch includes a frame 42, a rotating arm 43, a driving shaft 44, a cylinder 45 and a positioning plate 46. The frame 42 is configured as a U-shaped frame, and the bottom sides of the frame 42 are fixedly connected to the two sides of the driving shaft 44 through the rotating arms 43, respectively. The upper end of the frame 42 is fixedly connected to the cylinder body of the cylinder 45, and the ends of the two rotating arms 43 are connected through After the connecting shaft is connected, it is connected to the piston rod of the cylinder 45. The two rotating arms 43 move in the positioning plate 46 along the length direction of the driving shaft 44. The photoelectric sensor II7 and the photoelectric sensor III8 are fixed on the positioning plate 46. The driving shaft 44 is connected to the driven shaft 41 through the end face gear meshing. An electromagnetic reversing valve is arranged on the connecting gas path of the cylinder 45. The electromagnetic reversing valve can be set as a three-position four-way valve, including a pressure-maintaining position in the middle. The upper computer is respectively provided with control buttons of "closing I" and "opening I" for the clutch I4, and "closing II" and "opening II" for the clutch II5. " control button, by pressing the closing button, the PLC control unit is given a closing control command, and the PLC control unit controls the electromagnetic reversing valve to change direction, so that the piston rod of the cylinder 45 extends, and the rotating arm 43 moves to the left of the positioning plate 46, thereby driving the active shaft 44 to move in the direction of the driven shaft 41, until the end face teeth of the active shaft 44 and the driven shaft 41 are engaged, and at the same time, the end of the rotating arm 43 reaches the detection position of the photoelectric sensor III8, and the photoelectric sensor III8 transmits the closing position signal to the PLC control unit, and the PLC control unit controls the electromagnetic reversing valve to change direction again Keep the piston rod of cylinder 45 in place. According to the same principle, when the opening button is pressed, the PLC control unit controls the electromagnetic reversing valve to change direction again, so that the rotating arm 43 moves to the right of the positioning plate 46, driving the active shaft 44 to move away from the driven shaft 41 until the end teeth of the active shaft 44 and the driven shaft 41 are separated, and at the same time, the end of the rotating arm 43 reaches the detection position of the photoelectric sensor Ⅱ7. The photoelectric sensor Ⅱ7 transmits the opening position signal to the PLC control unit, and the PLC control unit controls the electromagnetic reversing valve to change direction again to keep the piston rod of cylinder 45 in place.

[0042] In addition, if Figure 2 , Figure 3 and Figure 4As shown, the end teeth of the driving shaft 44 and the driven shaft 41 are set as trapezoidal teeth, and the number of the end teeth of the driving shaft 44 or the driven shaft 41 is set to 4 to 6. When there is a range deviation between the two groups of pushers 2 or steel tappers 3, the structure of the trapezoidal teeth makes it easy for the end teeth to bite in. The pusher 2 or the steel tapper 3 is provided with a fixed box outside, and the positioning plate 46 is horizontally fixed on the inner wall of the fixed box. The positioning plate 46 is provided with a U-shaped groove 461 with an opening toward the cylinder 45. The photoelectric sensor II 7 and the photoelectric sensor III 8 are slidably installed in the U-shaped groove 461, which is convenient for debugging and installing the positions of the photoelectric sensor II 7 and the photoelectric sensor III 8. The positioning plate 46 is also provided with a guide groove 462 that is clearance-matched with the two rotating arms 43, so that the two rotating arms 43 swing in the guide groove 462, so that the movement of the driving shaft 44 is more stable, the deflection of the driving shaft 44 during the movement is prevented, and the bite of the end teeth of the driving shaft 44 and the driven shaft 41 is more accurate.

[0043] In addition, a hydraulic control component for driving the two groups of steel-outlets 3 to rise or fall as a whole is provided at the bottom of the two groups of steel-outlets 3. The hydraulic control component (not shown in the figure) includes a hydraulic cylinder and a fixed platform. The piston rod of the hydraulic cylinder is connected to the drive motor 91 at both ends of the two groups of steel-outlets 3 through the fixed platform.

[0044] The control method for controlling a single row of billets to enter and exit a push-steel heating furnace using the above-mentioned steel entry and exit control system comprises the following steps:

[0045] 1) After the two groups of pushers 2 finish pushing steel, the drive motor 91 of each pusher 2 rotates in the opposite direction, driving the pusher arm of the pusher 2 to retreat, and the encoder 10 detects the stroke of the drive motor 91 in real time. When the pusher arm reaches the pusher stroke, the drive motor 91 starts to decelerate until the rear end of the pusher arm is detected by the photoelectric sensor Ⅰ6. Then the photoelectric sensor Ⅰ6 transmits the retreat position signal to the PLC control unit, and the PLC control unit controls the drive motor 91 to stop rotating and clears the steel-out stroke detected by the encoder 10;

[0046] 2) When the single-row billet to be heated is running on the furnace roller table, the "closing I" button on the upper computer is operated to control the reversal of the electromagnetic reversing valve between the two sets of pushers 2 through the PLC control unit, so that the piston rod of the cylinder 45 drives the rotating arm 43 to swing, so that the end face teeth on the driving shaft 44 and the driven shaft 41 are engaged to complete the closing action;

[0047] 3) When the end of the rotating arm 43 reaches the detection position of the photoelectric sensor III8, the photoelectric sensor III8 determines the closing position signal and transmits the signal to the PLC control unit. The PLC control unit controls the electromagnetic reversing valve to reverse and maintain pressure, so that the piston rod of the cylinder 45 remains in place, and then the PLC control unit controls the driving motor 91 of the steel pusher 2 to rotate, so that the steel pusher arm of the steel pusher 2 is slowly extended at a set speed. Generally, the extension speed of the steel pusher arm is 0.15m / s to 0.25m / s, and the speeds of the two driving motors 91 are matched to prevent the problem of tripping caused by excessive current in one of the driving motors 91 due to excessive running too fast. When the steel pusher arm contacts the single-row billet, the driving motor 91 continues to rotate at a uniform speed. When the steel pusher arm is about to reach the furnace door of the heating furnace 1, the driving motor 91 decelerates and rotates, and the single-row billet is decelerated and pushed into the heating furnace 1, so that the pushing is more stable and the influence of inertia on the stroke is reduced;

[0048] 4) When the single-row billet after heating treatment in the heating furnace 1 is transported out of the furnace, the "closing II" button on the upper computer is operated to control the reversal of the electromagnetic reversing valve between the two groups of steel tapping machines 3 through the PLC control unit, so that the piston rod of the cylinder 45 drives the rotating arm 43 to swing, so that the driving shaft 44 of the steel tapping machine 3 is meshed with the end face teeth on the driven shaft 41 to complete the closing action;

[0049] 5) When the end of the rotating arm 43 reaches the detection position of the photoelectric sensor III8, the photoelectric sensor III8 determines the closing position signal and transmits the signal to the PLC control unit. The PLC control unit controls the electromagnetic reversing valve to reverse and maintain pressure, so that the piston rod of the cylinder 45 remains in place, and then the PLC control unit controls the drive motor 91 to rotate so that the steel-taking arm of the steel-taking machine 3 is slowly extended at a set speed. The extension speed of the steel-taking arm is 0.15m / s to 0.25m / s, and the speeds of the two drive motors 91 are matched to prevent one of the drive motors 91 from running too fast and causing an instantaneous current of too large to produce To solve the problem of tripping, when the steel-taking arm contacts the single-row billet, the hydraulic control component of the steel-taking machine 3 lifts up a stroke, and the drive motor 91 rotates in the opposite direction to make the steel-taking arm of the steel-taking machine 3 retreat at a uniform speed. When the photoelectric sensor Ⅰ6 near the steel-taking machine 3 detects the retreat position signal of the steel-taking machine 3 and transmits the position signal to the PLC control unit, the PLC control unit controls the drive motor 91 to stop rotating and resets the steel-taking stroke detected by the encoder 10. Then the steel-taking machine 3 descends under the drive of the hydraulic control component, so that the single-row billet taken out of the heating furnace 1 falls onto the discharge roller and is transported to the next station.

[0050] The method for controlling the double-row billet in and out of the push-steel heating furnace using the above-mentioned steel in and out control system comprises the following steps:

[0051] 1) After the two groups of pushers 2 finish pushing steel, the drive motor 91 of each pusher 2 rotates in the opposite direction, driving the pusher arm of the pusher 2 to retreat, and the encoder 10 detects the stroke of the drive motor 91 in real time. When the pusher arm reaches the pusher stroke, the drive motor 91 starts to decelerate until the rear end of the pusher arm is detected by the photoelectric sensor Ⅰ6. Then the photoelectric sensor Ⅰ6 transmits the retreat position signal to the PLC control unit, and the PLC control unit controls the drive motor 91 to stop rotating and clears the steel-out stroke detected by the encoder 10;

[0052] 2) When the double-row billets to be heated are running on the furnace roller table, the "open gate I" button on the upper computer is operated to control the reversal of the electromagnetic reversing valve between the two sets of pushers 2 through the PLC control unit, so that the piston rod of the cylinder 45 drives the rotating arm 43 to swing, so that the end face teeth on the driving shaft 44 and the driven shaft 41 are separated to complete the opening action;

[0053] 3) When the end of the rotating arm 43 reaches the detection position of the photoelectric sensor II 7, the photoelectric sensor III 8 determines the gate opening position signal and transmits the signal to the PLC control unit. The PLC control unit controls the electromagnetic reversing valve to reverse and maintain pressure, so that the piston rod of the cylinder 45 stops moving. Then the PLC control unit controls the driving motor 91 of the steel pusher 2 to rotate, so that the steel pusher arm of the steel pusher 2 is slowly extended at a set speed. Generally, the speed of extending the steel pusher arm is 0.15m / s to 0.25m / s, and the speeds of the two driving motors 91 are matched to prevent the problem of tripping caused by excessive current in one of the driving motors 91 due to excessive running too fast. When the steel pusher arm contacts the double-row blanks, the driving motor 91 continues to rotate at a uniform speed. When the steel pusher arm is about to reach the furnace door of the heating furnace 1, the driving motor 91 slows down and rotates, and the double-row blanks are pushed into the heating furnace 1 at a slow speed, so that the pushing is more stable and the influence of inertia on the stroke is reduced.

[0054] 4) When the double-row billets after heating treatment in the heating furnace 1 are transported out of the furnace, the "open gate II" button on the upper computer is operated to control the reversal of the electromagnetic reversing valve between the two groups of steel tapping machines 3 through the PLC control unit, so that the piston rod of the cylinder 45 drives the rotating arm 43 to swing, so that the end face teeth on the driving shaft 44 and the driven shaft 41 of the steel tapping machine 3 are separated to complete the opening action;

[0055] 5) When the end of the rotating arm 43 reaches the detection position of the photoelectric sensor II 7, the photoelectric sensor II 7 determines that the gate is in place and transmits the signal to the PLC control unit. The PLC control unit controls the electromagnetic reversing valve to reverse and maintain pressure, so that the piston rod of the cylinder 45 stops moving. Then the PLC control unit controls the drive motor 91 to rotate so that the steel-taking arm of the steel-taking machine 3 is slowly extended at a set speed. The extension speed of the steel-taking arm is 0.15m / s to 0.25m / s, and the speeds of the two drive motors 91 are matched to prevent one of the drive motors 91 from running too fast and causing an instantaneous current of too large to produce In order to solve the problem of tripping, when the steel-taking arm contacts the single-row billet, the hydraulic control component of the steel-taking machine 3 is lifted upward for a certain distance, and the driving motor 91 rotates in the opposite direction to make the steel-taking arm of the steel-taking machine 3 retreat at a uniform speed. When the photoelectric sensor Ⅰ6 near the steel-taking machine 3 detects the retreat position signal of the steel-taking machine 3 and transmits the position signal to the PLC control unit, the PLC control unit controls the driving motor 91 to stop rotating and resets the steel-taking stroke detected by the encoder 10. Then the steel-taking machine 3 descends under the drive of the hydraulic control component, so that the double-row billet taken out of the heating furnace 1 falls onto the discharge roller and is transported to the next station.

[0056] In summary, after each steel pushing and taking action is completed, the control system can automatically return the steel pusher and steel taking machine to their initial positions, ensuring the normal steel pushing and steel taking actions of double-row and single-row billets, reducing the failure rate, and can perform accurate clutch actions with convenient clutch operation, ensuring that the steel pushing arm or steel taking arm is on the same horizontal line after closing, reducing the workload of operators and saving labor costs.

[0057] The above description is only used to illustrate some principles of the present invention. This specification is not intended to limit the present invention to the specific structure and application scope shown and described. Therefore, all corresponding modifications and equivalents that may be used belong to the patent scope applied for by the present invention.

Claims

1. A steel inlet and outlet control system for an end-in-end push-steel heating furnace, characterized in that: The invention comprises a heating furnace (1), a steel pusher (2), a steel tapping machine (3), a clutch I (4), a clutch II (5), a host computer and a PLC control unit. The steel pushing arms of the two sets of steel pushers (2) are connected via a clutch I (4), the steel taking arms of the two sets of steel tapping machines (3) are connected via a clutch II (5), the pushing ends of the two sets of steel pushers (2) are opposite to the feeding port of the heating furnace (1), the taking ends of the two sets of steel tapping machines (3) are opposite to the discharging port of the heating furnace (1), and the working initial position of the steel pusher (2) or the steel tapping machine (3) is provided with a A photoelectric sensor I (6) is provided, and the photoelectric sensor I (6) is electrically connected to the steel pusher (2) or the steel tapping machine (3) through a PLC control unit and resets the detection stroke of pushing and taking steel; a photoelectric sensor II (7) is provided at the open position of the clutch I (4) or the clutch II (5), and a photoelectric sensor III (8) is provided at the closed position of the clutch I (4) or the clutch II (5); the host computer, the photoelectric sensor II (7) and the photoelectric sensor III (8) are electrically connected to the clutch I (4) or the clutch II (5) through a PLC control unit; The clutch I (4) and the clutch II (5) have the same structure and are both configured as tooth clutches, including a left half clutch and a right half clutch. The left half clutch includes a driven shaft (41), and the driven shaft (41) is connected to the output shaft of the drive motor (91). The right half clutch includes a frame (42), a rotating arm (43), a driving shaft (44), a cylinder (45) and a positioning plate (46). The frame (42) is configured as a U-shaped frame. The bottom two sides of the frame (42) are connected to the driving shaft (44) through the rotating arms (43) and the two sides of the bottom of the frame (42). 4) fixed connection, the upper end of the frame (42) is fixedly connected to the cylinder body of the cylinder (45), the ends of the two rotating arms (43) are connected to the piston rod of the cylinder (45) through a connecting shaft, the two rotating arms (43) move along the length direction of the driving shaft (44) in the positioning plate (46), the photoelectric sensor II (7) and the photoelectric sensor III (8) are fixed on the positioning plate (46), and the driving shaft (44) and the driven shaft (41) are connected by end face tooth meshing; The end teeth of the driving shaft (44) and the driven shaft (41) are arranged as trapezoidal teeth, and the number of the end teeth of the driving shaft (44) or the driven shaft (41) is arranged to be 4 to 6; the bottom of the two groups of steel tapping machines (3) is provided with a hydraulic control component for driving the two groups of steel tapping machines (3) to rise or fall as a whole.

2. The end-in-end-out push-steel heating furnace inlet and outlet steel control system according to claim 1 is characterized in that: The steel pusher (2) and the steel tapping machine (3) both include a gear rack drive mechanism (9), and the gear rack drive mechanism (9) includes a drive motor (91), a gear (92) and a rack bar (93), the output shaft end of the drive motor (91) is connected to the gear (92), and the gear (92) is meshed with the rack bar (93).

3. The end-in-end-out push-steel heating furnace inlet and outlet steel control system according to claim 2 is characterized in that: The drive motor (91) is provided with an encoder (10) for detecting the stroke of the drive motor (91); the encoder (10) is electrically connected to the drive motor (91) through a PLC control unit to control the speed of the drive motor (91); the photoelectric sensor I (6) is connected in parallel with the encoder (10) and is electrically connected to the drive motor (91) through the PLC control unit to control the drive motor (91) to stop at the designated position and to clear the stroke detected by the encoder (10).

4. The end-in-end-out push-steel heating furnace inlet and outlet steel control system according to claim 1 is characterized in that: A fixed box is arranged outside the steel pusher (2) or the steel tapping machine (3), and the positioning plate (46) is horizontally fixed on the inner wall of the fixed box. The positioning plate (46) is provided with a U-shaped groove (461) with an opening toward the cylinder (45), and the photoelectric sensor II (7) and the photoelectric sensor III (8) are slidably installed in the U-shaped groove (461). The positioning plate (46) is also provided with a guide groove (462) which is clearance-matched with the two rotating arms (43).

5. The end-in-end-out push-steel heating furnace inlet and outlet steel control system according to claim 4 is characterized in that: An electromagnetic reversing valve is arranged on the connecting gas path of the cylinder (45), and the host computer is connected to the electromagnetic reversing valve via a PLC control unit.

6. A control method for a single row of billets entering and exiting a pusher type heating furnace, using the end-in-end-out pusher type heating furnace inlet and outlet steel control system as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: 1) After the two groups of steel pushers (2) finish pushing steel, the driving motor (91) of each steel pusher (2) rotates in the opposite direction, driving the steel pushing arm of the steel pusher (2) to retreat, and the encoder (10) detects the stroke of the driving motor (91) in real time. When the steel pushing stroke of the steel pushing arm is reached, the driving motor (91) starts to decelerate until the rear end of the steel pushing arm is detected by the photoelectric sensor I (6), and then the photoelectric sensor I (6) transmits a retreat position signal to the PLC control unit, and the PLC control unit controls the driving motor (91) to stop rotating and clears the steel discharge stroke detected by the encoder (10); 2) When the single row of billets to be heated is running on the furnace roller table, the upper computer is operated to control the electromagnetic reversing valve between the two sets of pushers (2) through the PLC control unit, so that the piston rod of the cylinder (45) drives the rotating arm (43) to swing, so that the end face teeth on the driving shaft (44) and the driven shaft (41) are engaged to complete the closing action; 3) When the end of the rotating arm (43) reaches the detection position of the photoelectric sensor III (8), the photoelectric sensor III (8) determines the closing position signal and transmits the signal to the PLC control unit. The PLC control unit controls the electromagnetic reversing valve to change direction, so that the piston rod of the cylinder (45) stops moving. Then the PLC control unit controls the driving motor (91) of the steel pusher (2) to rotate, so that the steel pusher arm of the steel pusher (2) slowly extends at a set speed. When the steel pusher arm contacts the single-row blank, the driving motor (91) continues to rotate at a uniform speed. When the steel pusher arm is about to reach the furnace door of the heating furnace (1), the driving motor (91) slows down and pushes the single-row blank into the heating furnace (1). 4) When the single-row billet after the heating treatment in the heating furnace (1) is transported out of the furnace, the upper computer is operated to control the reversal of the electromagnetic reversing valve between the two sets of steel tapping machines (3) through the PLC control unit, so that the piston rod of the cylinder (45) drives the rotating arm (43) to swing, so that the driving shaft (44) of the steel tapping machine (3) and the end face teeth on the driven shaft (41) are meshed to complete the closing action; 5) When the end of the rotating arm (43) reaches the detection position of the photoelectric sensor III (8), the photoelectric sensor III (8) determines the closing position signal and transmits the signal to the PLC control unit. The PLC control unit controls the electromagnetic reversing valve to change direction, so that the piston rod of the cylinder (45) stops moving. Then the PLC control unit controls the driving motor (91) to rotate so that the steel taking arm of the steel tapping machine (3) slowly extends at a set speed. When the steel taking arm contacts the single row of billets, the hydraulic control component of the steel tapping machine (3) lifts up a stroke, and the driving motor (91) drives the steel tapping machine (3) to move. The driving motor (91) rotates in the reverse direction to make the steel-taking arm of the steel-taking machine (3) retreat at a uniform speed. When the photoelectric sensor I (6) near the steel-taking machine (3) detects the retreat position signal of the steel-taking machine (3) and transmits the position signal to the PLC control unit, the PLC control unit controls the driving motor (91) to stop rotating and resets the steel-taking stroke detected by the encoder (10). Then, the steel-taking machine (3) descends under the drive of the hydraulic control component, so that the single-row billet taken out of the heating furnace (1) falls onto the furnace discharge roller and is transported to the next station.

7. A control method for a double-row billet inlet and outlet pusher type heating furnace, using the end-in-end-out pusher type heating furnace inlet and outlet steel control system as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: 1) After the two groups of steel pushers (2) finish pushing steel, the driving motor (91) of each steel pusher (2) rotates in the opposite direction, driving the steel pushing arm of the steel pusher (2) to retreat, and the encoder (10) detects the stroke of the driving motor (91) in real time. When the steel pushing stroke of the steel pushing arm is reached, the driving motor (91) starts to decelerate until the rear end of the steel pushing arm is detected by the photoelectric sensor I (6), and then the photoelectric sensor I (6) transmits a retreat position signal to the PLC control unit, and the PLC control unit controls the driving motor (91) to stop rotating and clears the steel discharge stroke detected by the encoder (10); 2) When the double-row billets to be heated are running on the furnace roller table, the upper computer is operated to control the electromagnetic reversing valve between the two sets of pushers (2) through the PLC control unit, so that the piston rod of the cylinder (45) drives the rotating arm (43) to swing, so that the end face teeth on the driving shaft (44) and the driven shaft (41) are separated to complete the opening action; 3) When the end of the rotating arm (43) reaches the detection position of the photoelectric sensor II (7), the photoelectric sensor III (8) determines that the gate is in place and transmits the signal to the PLC control unit. The PLC control unit controls the electromagnetic reversing valve to change direction, so that the piston rod of the cylinder (45) stops moving. Then the PLC control unit controls the driving motor (91) of the steel pusher (2) to rotate, so that the steel pusher arm of the steel pusher (2) slowly extends at a set speed. When the steel pusher arms of the two groups of steel pushers (2) contact the double-row blanks, the driving motor (91) continues to rotate at a uniform speed. When the steel pusher arms are about to reach the furnace door of the heating furnace (1), the driving motor (91) slows down and pushes the double-row blanks into the heating furnace (1). 4) When the double-row billets are transported out of the heating furnace (1) after being heated, the upper computer is operated to control the electromagnetic reversing valve between the two sets of steel tapping machines (3) through the PLC control unit, so that the piston rod of the cylinder (45) drives the rotating arm (43) to swing, so that the end face teeth on the driving shaft (44) and the driven shaft (41) of the steel tapping machine (3) are separated to complete the opening action; 5) When the end of the rotating arm (43) reaches the detection position of the photoelectric sensor II (7), the photoelectric sensor II (7) determines that the gate is in place and transmits the signal to the PLC control unit. The PLC control unit controls the electromagnetic reversing valve to change direction, so that the piston rod of the cylinder (45) stops moving. Then the PLC control unit controls the driving motor (91) to rotate so that the steel taking arm of the steel machine (3) slowly extends at a set speed. When the steel taking arm contacts the double-row billet, the hydraulic control component of the steel machine (3) is lifted upward for a stroke, and the driving motor (91) is driven to rotate. The driving motor (91) rotates in the reverse direction to make the steel-taking arm of the steel-taking machine (3) retreat at a uniform speed. When the photoelectric sensor I (6) near the steel-taking machine (3) detects the retreat position signal of the steel-taking machine (3) and transmits the position signal to the PLC control unit, the PLC control unit controls the driving motor (91) to stop rotating and resets the steel-taking stroke detected by the encoder (10). Then, the steel-taking machine (3) descends under the drive of the hydraulic control component, so that the double-row billets taken out of the heating furnace (1) fall onto the furnace discharge roller and are transported to the next workstation.

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